Precious stone



FIG. 1 is a front view of the precious stone of the present design.

FIG. 2 is a back view of the design of the precious stone of FIG. 1.

FIG. 3 is a left side view of the design of the precious stone of FIG.1.

FIG. 4 is a right side view of the design of the precious stone of FIG.1.

FIG. 5 is a top view of the design of the precious stone of FIG. 1; and,

FIG. 6 is a bottom view of the design of the precious stone of FIG. 1.

CLAIM The ornamental design for a precious stone, as shown anddescribed.